Investments (Details) - Allowance for Expected Credit Losses - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Allowance for expected credit losses [Roll Forward]
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, beginning of period	$ 5
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, end of period	3
Total net impairment charges, including credit impairments, reported in net realized investment gains in the consolidated statement of income	$ 3	$ 1
Credit losses on fixed maturities recognized in the consolidated statement of income, as a percentage of the fixed maturity portfolio on a pre-tax basis (less than)	1.00%	1.00%
Credit losses on fixed maturities recognized in the consolidated statement of income, as a percentage of shareholders' equity on an after-tax basis (less than)	1.00%	1.00%
Corporate and all other bonds [Member]
Allowance for expected credit losses [Roll Forward]
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, beginning of period	$ 5	$ 3
Additions for expected credit losses on securities where no credit losses were previously recognized	3	0
Additions for expected credit losses on securities where credit losses were previously recognized	0	1
Reductions due to sales/defaults of credit-impaired securities	(5)	0
Reductions for impairments of securities which the Company intends to sell or more likely than not will be required to sell	0	0
Allowance for expected credit losses on fixed maturities classified as available-for-sale, balance, end of period	$ 3	$ 4